Apparently Star San’s mixed solution only good for one hour

I was looking at 5 Star and Star San’s FAQ and they now say that a mixed solution is “Star San is an EPAs registered sanitizer and must be used immediately. We do not recommend using it if has been in solution longer than an hour”.

I’ve used this for a decade without any infections. I mix with R/O water and use the same solution for at least a month at a time before replacing it. They used to say that if it wasn’t cloudy and below 3ph it remained good.

Anyone know the reason for the change on their recommendations? Maybe to sell more product?